Gerson therapy- 

is a dietary system for curing diseases that are theorized to be caused by toxicity and nutritional deficiency.  The system uses “coffee enemas” to “eliminate toxins from the liver” and consuming up to 20 lbs of organically grown fruits and vegetables every day in the form primarily of raw juice extracts.   The diseases  purportedly cured by this system include tuberculosis, cancer, and migraine headaches in addition to a laundry list of other diseases.   There is very little evidence such a system cures anything, the coffee ground enemas have been shown to do virtually nothing, however the beneficial effects of the nutrients may have a modest positive effect on overall health.   Painbytes assessment is one thumb down due to claims of disease cures without any proof or evidence.